U

UDP (User Datagram Protocol), 522

.ui (user interface file), 206, 207, 515

ultimate base class; see object type underscores, leading, 77, 80, 82 unichr(), 21, 39,236,554 Unicode, 20,117,236,250, 258, 447, 478,512, 552, 555 characters, 22

encodings, 20, 21,250,258, 501 see also ASCII, codecs, and QString unicode type, 20-28,25,256,401 % formatting, 24 %s format specifier, 26 * replication operator, 25 + concatenation operator, 25 count(), 25

endswith(), 25, 31, 555 find(), 24, 25, 68 index(), 24,25, 68 indexing, 22 isalpha(),25 isdigit(), 25,238, 554 iterating, 50

join(), 23,25, 61,193, 477 literals, 20, 21 lower(), 25,238 promotion to QString, 28 replace(), 25,238 rfind(), 25 rindex(), 25 slicing, 22

split(), 25,114,238, 501 startswith(), 25,238,255 strip(), 25, 59,255 title(), 24 upper(),25

see also str type and QString

union() (set), 38 unit testing, 105-107 universal newlines, 256 unlock()

unlock() (cont.) QMutex, 553, 554 QReadWriteLock, 541, 542, 543, 548, 550, 551, 556 unpacking tuples, 87 unsaved changes, 168,187,192,232, 293, 356, 361, 362,364, 365,425, 453 update()

QGraphicsItem, 365, 367 QGraphicsScene, 354 QWidget, 306, 330, 332, 479, 482 updateGeometry() (QWidget), 330, 332, 479

upper() (str/unicode),25 urlopen() (urllib2), 126 urlretrieve() (urllib), 521 user actions; see QAction user interface design, 205-216 user preferences; see QSettings UTF-8 encoding, 236,250,258, 501, 555

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